This is an original equipment manufacturer replacement or spare magazine for the Benjamin Sheridan Bulldog. It's constructed from polymer and holds 5 rounds of .357 caliber airgun ammunition. This is a rotary style magazine that auto-rotates a fresh round into the breech each time the airgun is cocked and clear indicators for full or empty. When you choose OEM magazines, you can be assured of getting the same quality materials and attention to manufacturing as the magazines originally supplied with your airgun. If you need a spare magazine, you need this Benjamin Bulldog Clip.